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Cars, Maisto 1/18 are good, decent detauls, and cost under $20.
Buildings are a bit more difficult to find. The Spawn Alley set is decent for 1/18, but not perfect.
Twch deck and flick trix have some sets that are useful.
There was a company, forget the name, my tiny, maybe, that was based from Hong Kong that had some street sets and accessories in 1/18. Have to look it up.